{
  "manageEntity": {
    "action": "Save",
    "entityId": "564484",
    "entityType": "Track",
    "nonce": "0xd8825af5d46f245cc8e74e99479e73fbe7c53a94dcd00bb755b312b98ff4ed21",
    "signature": "0x834051592014f259a37b3a746bc650fae3d21e7aeb4270d124d95239c0c85a497f58d3543e7eeb748f3bf6c799b7013e1c4203da6f75f581a6063fe7f032c8bc1c",
    "signer": "0xA9012b628a5Bed1406f97647fc6Be02eC3BF75b1",
    "userId": "141875639"
  }
}